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Re: LF: Hartmut's Grabber -- QRP TA

To: [email protected]
Subject: Re: LF: Hartmut's Grabber -- QRP TA
From: [email protected]
Date: Sun, 12 Jan 2014 08:35:01 -0330 (NST)
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Congrats on your grabber, Markus.  The output was less than 5 watts, 0.4
amps RF so this is a true QRP TA reception.  It almost appears as if
the QRP path is a bit to the south by the greenish colour. Hartmut's
grabber showed fairly consistent copy until about 0745 and TF3HZ was good until the QRM at 1000.
73
Joe VO1NA

On Sun, 12 Jan 2014, Markus Vester wrote:

Joe, much brighter here since about 0:30!  73, Markus



From: Markus Vester
Sent: Sunday, January 12, 2014 1:32 AM
To: [email protected]
Subject: Re: LF: Hartmut's Grabber -- QRP TA


Joe,

can't really say I'm seeing much here so far. Not even in 438 µHz, except for a 
couple of dim pixels in a row around 21 UT. Hartmut's grabber is doing much 
better at 11 mHz!

Best 73,
Markus (DF6NM)


From: [email protected]
Sent: Saturday, January 11, 2014 8:33 PM
To: [email protected]
Subject: Re: LF: Hartmut's Grabber -- QRP TA


Hi Markus,

Carrier on since 1920 UTC. 5 watts.  While looking at the messy breadboard
and trying to draw the schematic, I decided that it would be quicker to just
run the Decca using the power supply for the class E amp at reduced
voltage.

73 & GL
Joe VO1NA

On Fri, 10 Jan 2014, Markus Vester wrote:

Yes Joe, 100% duty cycle would be ideal. But occasional CW or QRSS id's won't 
hurt either, as long as phase is being preserved.

73, Markus


From: [email protected]
Sent: Friday, January 10, 2014 8:21 PM
To: [email protected]
Subject: Re: LF: Hartmut's Grabber -- QRP TA


Hi Markus,

That is most interesting.   I remember that occasion when TX was on later
than usual.  It will take a bit of tinkering to get the phase coherent exciter
to the class E TX, but this is long overdue anyway.  Would you like
a continuous QRP carrier without any keying?

Best Regards
Joe VO1NA

On Fri, 10 Jan 2014, Markus Vester wrote:

Joe,

when you were sending CW a couple of days ago, the coherent carrier was 
detectable in my 438 uHz spectrogram in broad daylight, until 12 UT! So I'm 
wondering how a low power straight carrier would fare during night and day?

Best 73,
Markus



From: [email protected]
Sent: Friday, January 10, 2014 7:44 PM
To: [email protected]
Subject: Re: LF: Hartmut's Grabber -- QRP TA


Hi Hartmut,

Yes, DCF39 must be a real pest as it is so close geographically and
in frequency. You seem to be dealing with it very effectively.
Thank-you for running the grabber.

It's a pest over here too, but sometimes useful to check the RX system.

The TX will be on again tonight. In keeping with the spirit of energy
conservation being requested by our power company, the TX will run
at <5 watts tonight to the 100m wire.  I hope to watch for the signals
on your grabber.

Cheers
Joe VO1NA

On Fri, 10 Jan 2014, Hartmut Wolff wrote:

Hello Joe,

thank you for your kind words!

Still struggling here with my local Pest DCF39. Between 03:15 and 04:40 UTC
DCF39 was sending a higher pulse frequence. That is the reason of the higher
noise level at that time and poorer reception of your beacon.

Thank you for your signal!

73
Hartmut


Am 2014-01-10 13:26, schrieb [email protected]:
Hello Hartmut and Group,

Even with only 65 watts from the TX, strong QRSS100 signals were seen on
Hartmut's grabber at 137.777 so the power was cut to <10 watts by
reducing the drain voltage of the class E amp to 12 V. The grabber
traces faded substantially, but rebounded to clearly readable around
0630 utc.

Congrats on your impressive RX setup, Martmut!

73
Joe VO1NA








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